src/go/parser/testdata/sort.go2

package sort

type orderedSlice[Elem comparable] []Elem

func (s orderedSlice[Elem]) Len() int           { return len(s) }
func (s orderedSlice[Elem]) Less(i, j int) bool { return s[i] < s[j] }
func (s orderedSlice[Elem]) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }

// OrderedSlice sorts the slice s in ascending order.
// The elements of s must be ordered using the < operator.
func OrderedSlice[Elem comparable](s []Elem) {
	sort.Sort(orderedSlice[Elem](s))
}

type sliceFn[Elem any] struct {
	s []Elem
	f func(Elem, Elem) bool
}

func (s sliceFn[Elem]) Len() int           { return len(s.s) }
func (s sliceFn[Elem]) Less(i, j int) bool { return s.f(s.s[i], s.s[j]) }
func (s sliceFn[Elem]) Swap(i, j int)      { s.s[i], s.s[j] = s.s[j], s.s[i] }

// SliceFn sorts the slice s according to the function f.
func SliceFn[Elem any](s []Elem, f func(Elem, Elem) bool) {
	Sort(sliceFn[Elem]{s, f})
}